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Leases (Lease Expense) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Leases [Abstract]    
Operating lease cost $ 7.3 $ 7.0
Sublease income (0.4) (0.4)
Lease, Cost $ 6.9 $ 6.6